TEST(1) Commands and Applications TEST(1)
test - Condition evaluation utility.
The test utility evaluates the expression and, if it evaluates to true,
returns a zero (true) exit status; otherwise it returns 1 (false). If
there is no expression, test also returns 1 (false).
All operators and flags are separate arguments to the test utility.
The following primaries are used to construct expression:
True if file exists and is a block special file.
True if file exists and is a character special file.
True if file exists and is a directory.
True if file exists (regardless of type).
True if file exists and is a regular file.
True if file exists and its set group ID flag is set.
True if the length of string is nonzero.
True if file is a named pipe (FIFO).
True if file exists and is readable.
True if file exists and has a size greater than zero.
-t [ file_descriptor ]
True if the file whose file descriptor number is file_descriptor
(default 1) is open and is associated with a terminal.
True if file exists and its set user ID flag is set.
True if file exists and is writable. True indicates only that
the write flag is on. The file is not writable on a read-only
file system even if this test indicates true.
True if file exists and is executable. True indicates only that
the execute flag is on. If file is a directory, true indicates
that file can be searched.
True if the length of string is zero.
string True if string is not the null string.
s1 = s2
True if the strings s1 and s2 are identical.
s1 != s2
True if the strings s1 and s2 are not identical.
n1 -eq n2
True if the integers n1 and n2 are algebraically equal.
n1 -ne n2
True if the integers n1 and n2 are not algebraically equal.
n1 -gt n2
True if the integer n1 is algebraically greater than the integer
n1 -ge n2
True if the integer n1 is algebraically greater than or equal to
the integer n2 .
n1 -lt n2
True if the integer n1 is algebraically less than the integer n2
n1 -le n2
True if the integer n1 is algebraically less than or equal to
the integer n2 .
These primaries can be combined with the following operators:
True if expression is false.
expression1 -a expression2
True if both expression1 and expression2 are true.
expression1 -o expression2
True if either expression1 or expression2 are true.
( expression )
True if expression is true.
The -a operator has higher precedence than the -o operator.
The test grammar is inherently ambiguous. In order to assure a degree
of consistency, the cases described in the POSIX 1003.2, section
D11.2/4.62.4, standard are evaluated consistently according to the
rules specified in the standards document. All other cases are subject
to the ambiguity in the command semantics.
The -b, -c, -g, and -u operators always cause a false return value (as
of GNO v2.0.4) since block- and character-special files, and the setuid
and setgid bits are not currently available under GS/OS.
Because of the implementation of stat(2) under GNO v2.0.4, the -x oper-
ator will return false if file is a directory.
The test utility exits with one of the following values:
0 expression evaluated to true.
1 expression evaluated to false or expression was missing.
>1 An error occurred.
This code is derived from software contributed to Berkeley by Kenneth
Almquist, and is based on BSD test version 5.4.
The GNO port of test was done by Devin Reade, <firstname.lastname@example.org>.
The test function is expected to be POSIX 1003.2 compatible.
GNO 19 October 1997 TEST(1)
Man(1) output converted with